diff --git a/src/image_util_jpeg.cpp b/src/image_util_jpeg.cpp
index 22d6ed480..22cd3539d 100644
--- a/src/image_util_jpeg.cpp
+++ b/src/image_util_jpeg.cpp
@@ -38,8 +38,8 @@
 namespace mapnik
 {
 
-jpeg_saver::jpeg_saver(std::ostream & stream, std::string const& t):
-    stream_(stream), t_(t) {}
+jpeg_saver::jpeg_saver(std::ostream & stream, std::string const& t)
+    : stream_(stream), t_(t) {}
 
 template <typename T>
 void process_rgba8_jpeg(T const& image, std::string const& type, std::ostream & stream)
@@ -54,6 +54,13 @@ void process_rgba8_jpeg(T const& image, std::string const& type, std::ostream &
             auto const& val = kv.second;
 
             if ( key == "jpeg" ) continue;
+            else if ( key.size() > 4  && key.substr(0,4) == "jpeg")
+            {
+                if (!mapnik::util::string2int(key.substr(4), quality))
+                {
+                    throw image_writer_exception("invalid jpeg quality: '" + key.substr(4)  + "'");
+                }
+            }
             else if ( key == "quality")
             {
                 if (val && ! (*val).empty())